Squid
Squid, sometimes considered shellfish, are related to octopuses. The term calamari can mean deep-fat fried squid or squid in general.
It is common to sell the condom-shaped hollow swimming organ alone, fresh or frozen. Squid are typically white, at least by the time of sale. The swimming organ may be stuffed whole or sliced into rings. The tentacles and legs are also edible, but rarely seen.
Ways to serve squid include:
deep-fat fried in batter (rings)
thrown into stir-fry (rings, or simply chopped)
in an Italian dish with tomato sauce, cheese, etc.
stuffed (be sure that the center gets hot enough to kill any bacteria)